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The unidentified man was allowed to remain for the rest of the rally, and Asheville police did not immediately return NBC News' request for comment on why the aggressive man was allowed to remain inside after his actions

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Just as Donald Trump on Monday was decrying Hillary Clinton for having called called "half" of his supporters "a basket of deplorables," an altercation broke out in the stands above him, NBC News reported.

Protesters are nothing new at Trump rallies, but before a group could be escorted out of U.S. Cellular Center Monday evening, a man from the crowd went over to violently confront them.

NBC News video of the incident shows the man with his hands on a protester's neck. Moments later, his hands furled into fists, the man lobbed a blow at the protester.

Clinton has used the deplorable phrase in reference to any "racist, sexist, homophobic, xenophobic [or] Islamophobic" Trump supporters.